Biology 9700/34 May June 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Investigating the effect of ethanol concentrations on yeast cell activity by measuring pH changes over time using Universal Indicator paper.

2. Serial dilution preparation for ethanol concentrations, reducing toxicity to yeast cells incrementally.

3. Measuring carbon dioxide production from yeast and glucose mixtures to assess metabolic activity under varying conditions.

4. Observing yeast cell structure under light microscopy, comparing effects of methylene blue and iodine stains.

5. Comparing structural differences between blood vessels using plan diagrams and identifying features associated with blood pressure regulation.

6. Calculating magnification from photomicrographs using scale bar measurements to analyze tissue structures.